Unity Shader Skeleton

// Unity Shader Doc https://docs.unity3d.com/Manual/SL-ShaderPrograms.html
// Unity Shader Doc https://docs.unity3d.com/Manual/SL-Reference.html


Shader "Custom/Test/foo shader" {
	//Variables
	Properties{
		// float, 2D (Texture), color etc.
		_MainTexture("Main Color (RGB)", 2D) = "white" {}
		_Color("Color", Color) = (1,1,1,1)
	}

	// Subshaders for example for diffferent Plattforms or Detail level
	SubShader{

		// Renderpasses - use as few as possible
		Pass{
			
			CGPROGRAM // the actual Shadercode beginning

			// Define what my vert and frag functions are going to be
			#pragma vertex vertexFunction
			#pragma fragment fragmentfunction

			#include "UnityCG.cginc" // include "Shader libraries" - Helpers for different use cases

			// Define the information from the Object I want to use
			// This can be for example
			// Vertices
			// Normals
			// Color
			// uvs etc.
			struct appdata{
				float4 vertex : POSITION; // type variable name : DATA <- The Keywords for the Data is Predefined I guess? 
				float2 uv : TEXCOORD0; 
			};

			// Creating the outputtype of our vertexFunction I guess?
			struct v2f{
				float4 position : SV_POSITION; 
				float2 uv: TEXCOORD0;
			};

			float4 _Color; // This will automatically get the _Color Reference from the Properties further up which can be set in the Unity Editor or by Script
			sampler2D _MainTexture;

			// Vertex Part - Build the Object
			v2f vertexFunction(appdata IN){
				v2f OUT;

				// Setting the Vars from my v2f Type / Object
				OUT.position = mul(UNITY_MATRIX_MVP, IN.vertex); // MVP = Model View Projection  / mul() from cg standard library http://http.developer.nvidia.com/Cg/index_stdlib.html
				OUT.uv = IN.uv;
				return OUT;
			}

			// Fragment Part - Color the Object
			fixed4 fragmentfunction(v2f IN) : SV_Target{ // Target -> Endresult

				float4 textureColor = tex2D(_MainTexture, IN.uv); // get the color from the sampler at the uv position

				float4 endColor = textureColor * _Color;
				return endColor; // final outcome is a color for this pixel
			}

			ENDCG // the actual Shadercode end
		}
	}
}